Amazon.com: Fosi Audio M04 Subwoofer Stereo Amplifier 100Watt 2-8ohm Mono Channel Class D Amp Home Theater Power Amp for Passive Speakers Subwoofer : Electronics
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HiFi 600W Mono Subwoofer/Full-Frequency Power Amplifier Home Audio Digital Amp | eBay
JL Audio XD600/1v2 Mono subwoofer amplifier — 600 watts RMS x 1 at 2 ohms at Crutchfield